From: YourPal (dearprudence28@gmail.com)
Date: Tue Mar 18 2008 - 02:48:26 ART
Hi Avner,
If we configure the command "switchport voice vlan <VVID>", what mode should
we configure? Understand that 3550 defaults to "dynamic desirable" and 3560
defaults to "dynamic auto". Leave it to the default?
I'm confused with the different types of voice vlan config. Say, I configure
"switchport voice vlan dot1p". According to DocCD, this command configures
the phone to use IEEE 802.1p priority tagging for voice traffic and to use
the default native VLAN (VLAN 0) to carry all traffic.
VLAN 0? How do I configure an SVI to provide a gateway to the voice subnet
and data subnet?
Thank you.
BR,
Emil
On 1/26/08, Avner Izhar <aizhar@ccbootcamp.com> wrote:
>
> Hi Daniel,
>
> As far as I know, the Cisco ip phones do not support DTP or VTP.
>
> If you connect a phone to a switch that has DTP in dynamic desirable, it
> will not negotiate a trunk.
>
> The recommended way is to configure an access mode port with a single
> tagged vlan,
> using the 'switchport voice vlan xx' command.
>
> That way you prevent floods, but allow separate vlan for voice and for
> data.
>
> Some old switches will require a trunk (the XL family of switches), on
> them it is a good idea to manually allow only two vlans.
>
> HTH,
> -------------------------------------------
> thanks,
> Avner Izhar
> CCIE#15999 (Voice), CCVP, CCSI# 31623
> Technical Training Manager
> CCBOOTCAMP - A Cisco Sponsored Organization (SO)
> Email: aizhar@ccbootcamp.com
> Toll Free: 877-654-2243
> Direct: +1-702-968-5100 = Outside the USA
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>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Daniel Valle
> Sent: Thursday, January 24, 2008 16:02
> To: ccielab@groupstudy.com
> Subject: IP Phones and trunks.
>
> Hi GS,
>
> I have a question: when an IP phone connects to a switch, by default,
> the switch will automatically establish a trunk with the IPphone.
> Good. I didn' check that yet, but this makes me conclude tha DTP is
> working in the IP phone. Does it also supports VTP ?
>
> To be clearer, If I configure vtp prunning in my switch domain and
> later on I plug a IP phone in an interface, is that new trunked
> interface prunned by default or will it be receiving
> floods/broadcast/multicast unnecessarily ( and so to solve it I make
> tune the vlan allowed list )?
>
>
> Thanks !
>
> Daniel
>
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